docs: def fix_facets(self):
          """
          This function convert date_histogram facets to datetime
          """
          facets = self.facets
          for key in list(facets.keys()):
              _type = facets[key].get("_type", "unknown")
              if _type == "date_histogram":
                  for entry in facets[key].get("entries", []):
                      for k, v in list(entry.items()):
                          if k in ["count", "max", "min", "total_count", "mean", "total"]:
                              continue
                          if not isinstance(entry[k], datetime):
                              entry[k] = datetime.utcfromtimestamp(v / 1e3)